TC: Where does Roofstock operate — in what markets? GB: We have listings in 15 markets across the U.S., each of which is unique and presents different characteristics and opportunities for investors to gain real estate exposure. TC: Do you have partnerships with other real estate brokers? GB: Using an outside broker is not a requirement for clients to buy or sell homes on Roofstock, but the marketplace does allow agents to earn referral fees when they register clients who transact through us, which enables agents to develop deeper relationships with their clients and expand their business opportunities. We’re also is beginning to work with agents to help them sell homes with tenants in place, which is more difficult to do through the traditional MLS channel.

https://techcrunch.com/2017/10/04/roofstock-a-marketplace-for-single-family-homes-with-tenants-just-closed-on-35-million-in-new-funding/